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Intangible Assets
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Disclosure [Text Block]
Intangible Assets
The following table summarizes intangible assets, net (in thousands):
 
September 30,
2019
 
December 31,
2018
Developed technology
$
13,323

 
$
13,383

Channel partner relationships
730

 
730

Capitalized development costs(1)
3,002

 
2,918

Customer relationships
380

 
380

 
17,435

 
17,411

Accumulated amortization:
 
 
 
Developed technology
(12,552
)
 
(12,222
)
Channel partner relationships
(324
)
 
(233
)
Capitalized development costs(1)
(1,972
)
 
(1,655
)
Customer relationships
(324
)
 
(303
)

(15,172
)
 
(14,413
)
Total finite-lived assets, net
2,263

 
2,998

Indefinite-lived intangible assets - trade names
350

 
350

Total intangible assets, net
$
2,613

 
$
3,348

________________
(1)
Includes the impact of foreign currency exchange rate fluctuations.
Amortization expense of intangible assets was $252,000 and $294,000 during the three months ended September 30, 2019 and 2018, respectively, and $771,000 and $1,434,000 during the nine months ended September 30, 2019 and 2018, respectively. Estimated amortization expense for intangible assets is expected to be approximately $256,000 for the remainder of 2019 and $932,000, $508,000, $358,000, $34,000, and $12,000 in fiscal 2020, 2021, 2022, 2023 and 2024, respectively.